Iron Bars needed for Knight's Sword quest can be found on the floor in the level 18 Wilderness to the West of Graveyard of Shadows. However, if you are gaming on Hardcore or Ultimate Ironman, better make them yourself. The Wilderness is the PvP zone, and RS gold you can get targeted against other players.
The process of training Smithing in lower level could be tedious. It is recommended that you get at a sufficient level prior to being able to cast Superheat item spell. Start via mining Iron to South-East Ardougne and superheating it into bars. If you own Ardougne Cloak 1.1, you can run to the bank for storage of your bars and teleport back using the cape.
If you're not keen to mine ores by yourself or buy them, you can purchase the ores from Ordan in the Blast Furnace. These bars need to be formed in the form of Iron Dart tips, which can aid you in Fletching training. Follow this process until you've got enough Dart Tips to be able to attain Level 55 Fletching.
When you reach 40 Smithing at this point, you are able to proceed to your next steps. Now , you must arrive at the Blast Furnace where you can buy gold ore through NPC Ordan. Be sure to complete the Family Feud quest to unlock Goldsmithing Gauntlets. Without them , this method is not as effective. After purchasing ores then they must be made to make Gold Bars. This method gives you the best satisfaction, but keep in mind that cheap OSRS gold it will be extremely costly. Players who have chosen to become the Ultimate Ironman can smith Mithril Platebodies from level 68 in the Blast Furnace.